An in-suit synthesis of COPs@ VSN for organic dyes adsorption

Organic dyes in wastewater pose severe ecological and health risks due to their toxicity and persistence. Covalent organic polymers (COPs) is an efficient adsorbent. However, it is difficulty for COPs to recycle and reuse due to their typical powder form. To solve this problem, we synthesized the COPs@VSN (Viscose spunlaced nonwoven material) via an in-situ solvothermal method. The results revealed fine grooves on VSN surface, with 0.5–1 nm spherical structure COP particles were anchored on COPs@VSN. When the dose of COPs 6 @VSN was 100 mg, the initial dye concentration was 50 mg/L, the adsorption temperature was 30 °C, the pH of the dye solution was 7, COPs 6 @VSN demonstrated exceptional selectivity for cationic dyes, the adsorption efficiency and capacity for MB can reach 99.7 % and 48.9 mg/g within 30 min, respectively. The adsorption of COPs 6 @VSN for MB is monolayer chemisorption, demonstrating spontaneous and endothermic characteristics. The adsorption efficiency and capacity of COPs 6 @VSN for MB maintained 69.8 % and 34.6 mg/g after five regeneration cycles, and had strong anti-interference capability against common ions. In view of its excellent cationic dye adsorption performance, fast adsorption equilibrium, and good reusability, COPs 6 @VSN exhibits significant potential for practical wastewater remediation applications.